A clean and tight jumper may have a resistance as low as what value?

A clean and tight jumper is designed to provide minimal resistance to ensure efficient electrical conduction. The values given in the choices are indicative of very low resistance levels, which is characteristic of well-constructed electrical connections.

The correct answer indicates that a resistance as low as 0.0005 ohms can be expected from a clean and tight jumper. This low resistance is crucial in applications where even minor resistive losses can lead to significant performance issues, such as in critical electrical infrastructure or high-frequency circuits. A jumper with this low resistance ensures that there is minimal voltage drop across it, maintaining the integrity and performance of the circuit.

Significantly lower resistance values (like 0.0001 ohms) can be difficult to achieve in practical applications, as factors such as manufacturing variances and material properties come into play. Thus, while it is theoretically possible to achieve extremely low resistances, 0.0005 ohms is a realistic and practical value for a well-made jumper in most scenarios.